/*
 * Copyright (c) 2013, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package com.oracle.svm.core.graal.nodes;

import com.oracle.svm.core.meta.SharedField;

import jdk.graal.compiler.nodes.FieldLocationIdentity;
import jdk.vm.ci.meta.ResolvedJavaField;

public class SubstrateFieldLocationIdentity extends FieldLocationIdentity {

    public SubstrateFieldLocationIdentity(ResolvedJavaField field, boolean immutable) {
        super(field, immutable);
    }

    public SubstrateFieldLocationIdentity(FieldLocationIdentity identity) {
        super(identity.getField(), identity.isImmutable());
    }

    @Override
    public boolean isImmutable() {
        /* We can also treat a field as immutable if the analysis determines it is never written. */
        return super.isImmutable() || (getField() instanceof SharedField sField && !sField.isWritten());
    }
}
